NH DHHS - DHHS Identifies a Second Horse with Eastern Equine Encephalitis

Concord, NH – The New Hampshire Department of Health and Human Services

(DHHS) is announcing that a horse from Sanbornton has been identified with

the Eastern Equine Encephalitis (EEE) virus infection. This is the second

finding of EEE in a horse this year, though a mule was identified with EEE

in September. Eighteen mosquito batches have also tested positive for EEE.

The arboviral risk level for the town of Sanbornton will increase from low

to high. The surrounding towns of Laconia, Belmont, and Tilton will

increase from low to moderate, and the towns of New Hampton, Franklin,

Hill, and Meredith will increase from no data/baseline to moderate risk.

EEE is transmitted by the bite of infected mosquitos. It is important that

people continue to take precautions against mosquito bites, including

wearing an effective repellent, long pants and sleeves, ensuring screens

are in good repair and removing standing water from your property to

prevent mosquitoes from breeding, until there has been a killing frost


“This is a sad reminder that we are not out of the woods yet as far as

mosquito diseases while the weather continues to stay moderate,” said Dr.

José Montero, Director of Public Health at DHHS. “Leaf season is a great

time to get outside but we urge residents and visitors to use an effective

repellent when doing so.”

Any horse that resides in or travels to New Hampshire during mosquito

season is at risk of becoming infected with EEE or West Nile Virus (WNV).

Because of this risk, it is recommended that horse owners consult with

their veterinarians to discuss appropriate vaccination schedules based on

their risk factors.

EEE is a more serious disease in people than WNV and carries a high

mortality rate for those who contract the serious encephalitis form of the

illness. Symptoms of EEE may include high fever, severe headache, stiff

neck, and sore throat. There is no treatment for the disease, which can in

some cases lead to seizures and coma. Symptoms usually occur 4 to 10 days

after being bitten. If you or someone you know is experiencing flu-like

symptoms, including fever and headache, contact your local medical


For more information about EEE and West Nile Virus visit the DHHS website

at http://www.dhhs.nh.gov/dphs/cdcs/arboviral/index.htm and the Centers for

Disease Control and Prevention website at www.cdc.gov. For questions

contact the DHHS Bureau of Infectious Disease Control at 603-271-4496.

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Prevention Guidelines for West Nile Virus and

Eastern Equine Encephalitis Virus

NH Department of Health and Human Services, Division of Public Health


1. Eliminate standing water and other mosquito breeding locations.

In warm weather, mosquitoes can breed in any puddle that lasts more than 4


· Remove old tires from your property.

· Dispose of tin cans, plastic containers, ceramic pots, or other

containers. Don’t overlook containers that have become overgrown

by aquatic vegetation.

· Drill holes in the bottom of recycling containers that are left


· Make sure roof gutters are clean and draining properly.

· Clean and chlorinate swimming pools and hot tubs. If not in use,

keep empty and covered and keep covers free of standing water.

· Aerate garden ponds or stock them with fish.

· Turn over wheelbarrows and change water in birdbaths at least

twice weekly.

· Turn over plastic wading pools when not in use.

· Remind or help neighbors to eliminate breeding sites on their


2. Be aware of where mosquitoes live and breed and keep them from entering

your home.

· Mosquitoes lay their eggs in standing water. Weeds, tall grass, and

bushes provide an outdoor home for adult mosquitoes, including

several species commonly associated with West Nile Virus and Eastern

Equine Encephalitis Virus.

· Mosquitoes can enter homes through unscreened windows or doors, or

broken screens. Make sure that doors and windows have tight-fitting

screens. Repair or replace all screens in your home that have tears

or holes.

· Resting mosquitoes can often be flushed from indoor resting sites by

using sweeping motions under beds, behind bedside tables etc. and

once in flight, exterminated prior to sleeping at night.

3. Protect yourself from mosquito bites.

· If outside during evening, nighttime, and dawn hours when mosquitoes

are most active and likely to bite, children and adults should wear

protective clothing such as long pants, long-sleeved shirts, and


· Consider the use of an effective insect repellent, such as one

containing DEET. A repellent containing 30% or less DEET

(N,N-diethyl-methyl-meta-toluamide) for children and adults. Use DEET

according to the manufacturer's directions. Children should not apply

DEET to themselves. Repellents that contain Picaridin or oil of lemon

eucalyptus have also been determined to be effective.

· Vitamin B, ultrasonic devices, incense, and bug zappers have not been

shown to be effective in preventing mosquito bites.

For more information on West Nile Virus or Eastern Equine Encephalitis

Virus, call the NH Department of Health and Human Services toll-free West

Nile Virus Information Line at

866–273–NILE (6543), or visit the West Nile Virus Website at